diff --git a/src/applications/conduit/method/differential/updatetaskrevisionassoc/ConduitAPI_differential_updatetaskrevisionassoc_Method.php b/src/applications/conduit/method/differential/updatetaskrevisionassoc/ConduitAPI_differential_updatetaskrevisionassoc_Method.php
index fc3a7a7edf..381faa7b70 100644
--- a/src/applications/conduit/method/differential/updatetaskrevisionassoc/ConduitAPI_differential_updatetaskrevisionassoc_Method.php
+++ b/src/applications/conduit/method/differential/updatetaskrevisionassoc/ConduitAPI_differential_updatetaskrevisionassoc_Method.php
@@ -57,18 +57,16 @@ final class ConduitAPI_differential_updatetaskrevisionassoc_Method
       $new_rev_phids = array();
     }
 
-    $task_class = PhabricatorEnv::getEnvConfig(
-      'differential.attach-task-class');
-    if (!$task_class) {
+    try {
+      $task_attacher = PhabricatorEnv::newObjectFromConfig(
+        'differential.attach-task-class');
+      $task_attacher->updateTaskRevisionAssoc(
+        $task_phid,
+        $orig_rev_phids,
+        $new_rev_phids);
+    } catch (ReflectionException $ex) {
       throw new ConduitException('ERR_NO_TASKATTACHER_DEFINED');
     }
-
-    PhutilSymbolLoader::loadClass($task_class);
-    $task_attacher = newv($task_class, array());
-    $task_attacher->updateTaskRevisionAssoc(
-      $task_phid,
-      $orig_rev_phids,
-      $new_rev_phids);
   }
 
 }
diff --git a/src/applications/conduit/method/differential/updatetaskrevisionassoc/__init__.php b/src/applications/conduit/method/differential/updatetaskrevisionassoc/__init__.php
index 0ad02cea4f..fc94d04391 100644
--- a/src/applications/conduit/method/differential/updatetaskrevisionassoc/__init__.php
+++ b/src/applications/conduit/method/differential/updatetaskrevisionassoc/__init__.php
@@ -10,8 +10,5 @@ phutil_require_module('phabricator', 'applications/conduit/method/base');
 phutil_require_module('phabricator', 'applications/conduit/protocol/exception');
 phutil_require_module('phabricator', 'infrastructure/env');
 
-phutil_require_module('phutil', 'symbols');
-phutil_require_module('phutil', 'utils');
-
 
 phutil_require_source('ConduitAPI_differential_updatetaskrevisionassoc_Method.php');
diff --git a/src/infrastructure/env/PhabricatorEnv.php b/src/infrastructure/env/PhabricatorEnv.php
index fa85bf0bc2..1335606d49 100644
--- a/src/infrastructure/env/PhabricatorEnv.php
+++ b/src/infrastructure/env/PhabricatorEnv.php
@@ -34,6 +34,7 @@ final class PhabricatorEnv {
     'aphront.default-application-configuration-class' =>
       'AphrontApplicationConfiguration',
     'controller.oauth-registration' => 'PhabricatorOAuthRegistrationController',
+    'differential.attach-task-class' => 'DifferentialTasksAttacher',
   );
 
   public static function setEnvConfig(array $config) {